Like 95% of issues with tubeless... user error. You let the sealant dry up. This is not the fault of any equipment or manufacturer. This is the responsibility of the end user. I've done it. We've all done it.
The cleaning the tires/rims thing, that I cannot relate to. Having any tire last a full year is something I've had happen all of once. What's to clean? It never got a large puncture, so I did nothing but add sealant to that tire between mounting and unmounting.
The checklist of drawbacks are all things that I have never encountered, and I have tubeless tires fitted to all bikes, in sizes from 23mm to 43mm wide. The most important rule of tubeless: if it's not at MTB running @ 20psi, don't use Stan's.
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